import { useEffect, useMemo, useState } from 'react';
import { Link, useNavigate, useParams } from 'react-router-dom';
import AppImage from '@dukang/shared-ui/AppImage';
import AppToast from '../components/AppToast';
import { request } from '../lib/api';
import { buildOrderAddressSelectUrl } from '../lib/navigation';
import { STITCH_ORDER_PRODUCT_IMAGE } from '../lib/order-images';
import { handleShareButtonClick } from '../lib/wechat-share';
import ContactCustomerSheet from '../components/ContactCustomerSheet';
import { usePageView } from '../lib/usePageView';

type OrderItem = {
  productName: string;
  productSpec: string;
  productImage: string;
  unitPrice: number;
  quantity: number;
};

type OrderDelivery = {
  provider?: string;
  trackingNo?: string;
  logisticsCompany?: string;
  manualQueryUrl?: string;
  providerOrderNo?: string;
};

type TrackNode = {
  trackInfo?: string;
  createdAt?: string;
};

type OrderPayment = {
  status?: string;
};

type Order = {
  id: string;
  orderNo: string;
  orderType?: string;
  isProxyOrder?: boolean;
  proxyPartnerName?: string | null;
  status: string;
  originOrderId?: string | null;
  remark?: string | null;
  receiverName: string;
  receiverPhone: string;
  receiverProvince?: string;
  receiverCity?: string;
  receiverDistrict?: string;
  receiverAddress: string;
  productAmount?: number;
  freightAmount?: number;
  payAmount: number;
  benefitAmount: number;
  createdAt: string;
  items?: OrderItem[];
  delivery?: OrderDelivery | null;
  payment?: OrderPayment | null;
};

const PROGRESS_STEPS = [
  { label: '下单成功' },
  { label: '出库中' },
  { label: '配送中' },
  { label: '待签收' },
  { label: '完成' },
] as const;

const STATUS_BANNER: Record<string, { title: string; subtitle: string }> = {
  PENDING_PAY: { title: '待付款', subtitle: '请尽快完成支付' },
  PENDING_SHIP: { title: '待发货', subtitle: '商家正在备货，请耐心等待' },
  OUT_WAREHOUSE: { title: '出库中', subtitle: '商品正在出库打包' },
  SHIPPING: { title: '配送中', subtitle: '您的佳酿正在赶往您的餐桌，请保持电话畅通' },
  PENDING_RECEIVE: { title: '待签收', subtitle: '包裹已送达，请确认签收' },
  COMPLETED: { title: '已完成', subtitle: '感谢您的购买，期待再次光临' },
  RESHIP: { title: '补发中', subtitle: '包裹正在揽收，请耐心等待' },
};

const EDITABLE_STATUSES = new Set(['PENDING_PAY', 'PENDING_SHIP', 'OUT_WAREHOUSE']);

function maskPhone(phone: string) {
  return phone.replace(/(\d{3})\d{4}(\d{4})/, '$1****$2');
}

function formatMoney(amount: number) {
  return amount.toLocaleString('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
}

function formatDateTime(value: string) {
  const d = new Date(value);
  if (Number.isNaN(d.getTime())) return value;
  const pad = (n: number) => String(n).padStart(2, '0');
  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`;
}

function progressActiveIndex(status: string) {
  switch (status) {
    case 'PENDING_PAY':
      return 0;
    case 'PENDING_SHIP':
      return 1;
    case 'OUT_WAREHOUSE':
      return 1;
    case 'SHIPPING':
      return 2;
    case 'PENDING_RECEIVE':
      return 3;
    case 'COMPLETED':
      return 4;
    default:
      return 0;
  }
}

function deliveryProviderLabel(provider?: string, company?: string) {
  if (company) return company;
  if (!provider || provider === 'MOCK' || provider === 'XFX' || provider === 'XIAOFEIXIA') return '小飞侠配送';
  if (provider === 'LOGISTICS') return '快递配送';
  return provider;
}

function fullReceiverAddress(order: Order) {
  const region = [order.receiverProvince, order.receiverCity, order.receiverDistrict]
    .filter(Boolean)
    .join('');
  if (region && order.receiverAddress.startsWith(region)) {
    return order.receiverAddress;
  }
  return `${region}${order.receiverAddress}`;
}

export default function OrderDetailPage() {
  const { id } = useParams();
  usePageView('order_detail_view', { orderId: id });
  const navigate = useNavigate();
  const [order, setOrder] = useState<Order | null>(null);
  const [showCs, setShowCs] = useState(false);
  const [copyHint, setCopyHint] = useState('');
  const [shareToast, setShareToast] = useState('');
  const [confirming, setConfirming] = useState(false);
  const [trackNodes, setTrackNodes] = useState<TrackNode[]>([]);

  const isReship = order?.orderType === 'RESHIPMENT';
  const isProxy = order?.orderType === 'PROXY' || order?.isProxyOrder === true;

  async function loadTrack() {
    if (!id) return;
    try {
      const data = await request<{ nodes?: TrackNode[] }>('USER_H5', `/trade/orders/${id}/track`);
      setTrackNodes(data.nodes ?? []);
    } catch {
      setTrackNodes([]);
    }
  }

  async function loadOrder() {
    if (!id) return;
    const data = await request<Order>('USER_H5', `/trade/orders/${id}`);
    setOrder(data);
    if (data.delivery?.trackingNo || data.delivery?.provider === 'XFX') {
      void loadTrack();
    }
  }

  useEffect(() => {
    loadOrder().catch(() => {});
  }, [id]);

  const banner = useMemo(() => {
    if (!order) return { title: '', subtitle: '' };
    if (isReship) return STATUS_BANNER.RESHIP;
    return STATUS_BANNER[order.status] ?? { title: order.status, subtitle: '' };
  }, [order, isReship]);

  const activeProgress = order ? progressActiveIndex(order.status) : 0;
  const item = order?.items?.[0];
  const productImage = item?.productImage || STITCH_ORDER_PRODUCT_IMAGE;
  const canEditAddress = order ? EDITABLE_STATUSES.has(order.status) : false;
  const canConfirmReceive = order?.status === 'PENDING_RECEIVE' && !isReship;
  const canPay = order?.status === 'PENDING_PAY' && !isReship;
  const canRefund =
    order &&
    !canPay &&
    ['PENDING_SHIP', 'PENDING_RECEIVE', 'COMPLETED', 'OUT_WAREHOUSE', 'SHIPPING'].includes(order.status);
  const canInvoice = order?.status === 'COMPLETED';
  const productTotal = Number(order?.productAmount ?? order?.payAmount ?? 0);
  const freightTotal = Number(order?.freightAmount ?? 0);

  async function copyOrderNo() {
    if (!order) return;
    try {
      await navigator.clipboard.writeText(order.orderNo);
      setCopyHint('已复制');
      window.setTimeout(() => setCopyHint(''), 2000);
    } catch {
      setCopyHint('复制失败');
    }
  }

  async function confirmReceive() {
    if (!id || !canConfirmReceive) return;
    setConfirming(true);
    try {
      const updated = await request<Order>('USER_H5', `/trade/orders/${id}/confirm-receive`, {
        method: 'POST',
      });
      setOrder(updated);
    } catch (e) {
      window.alert(e instanceof Error ? e.message : '确认收货失败');
    } finally {
      setConfirming(false);
    }
  }

  if (!order) return <div className="empty">加载中...</div>;

  return (
    <div className="order-detail-page order-detail-page--stitch">
      <header className="order-detail-topbar">
        <button type="button" className="order-detail-topbar-btn" aria-label="返回" onClick={() => navigate(-1)}>
          <span className="material-symbols-outlined">arrow_back_ios</span>
        </button>
        <h1 className="order-detail-topbar-title">杜康好客</h1>
        <div className="order-detail-topbar-actions">
          <button type="button" className="order-detail-topbar-btn" aria-label="分享" onClick={() => handleShareButtonClick(setShareToast)}>
            <span className="material-symbols-outlined">share</span>
          </button>
          <button type="button" className="order-detail-topbar-btn" aria-label="更多" onClick={() => {}}>
            <span className="material-symbols-outlined">more_horiz</span>
          </button>
        </div>
      </header>

      <AppToast message={shareToast} />

      <main className="order-detail-main order-detail-main--stitch">
        <section className="order-detail-status-card">
          <div className="order-detail-status-deco" aria-hidden>
            <span className="material-symbols-outlined">local_shipping</span>
          </div>
          <div className="order-detail-status-body">
            <div className="order-detail-status-head">
              <span className="material-symbols-outlined filled">local_shipping</span>
              <h2>{banner.title}</h2>
            </div>
            <p>{banner.subtitle}</p>
            {isProxy && order?.proxyPartnerName ? (
              <p className="label-md text-muted" style={{ marginTop: 8 }}>
                代下单 · 由合伙人 {order.proxyPartnerName} 代下
              </p>
            ) : null}
          </div>
        </section>

        {!isReship && (
          <section className="order-detail-card order-detail-progress-card">
            <div className="order-detail-progress">
              {PROGRESS_STEPS.map((step, index) => {
                const done = index < activeProgress;
                const active = index === activeProgress;
                const pending = index > activeProgress;
                return (
                  <div
                    key={step.label}
                    className={`order-detail-progress-step${active ? ' active' : ''}${done ? ' done' : ''}${pending ? ' pending' : ''}`}
                  >
                    {index < PROGRESS_STEPS.length - 1 && (
                      <span className={`order-detail-progress-line${done ? ' done' : ''}`} aria-hidden />
                    )}
                    <div className="order-detail-progress-dot">
                      {done && <span className="material-symbols-outlined">check</span>}
                      {active && <span className="order-detail-progress-pulse" />}
                      {pending && <span className="order-detail-progress-idle" />}
                    </div>
                    <span className="order-detail-progress-label">{step.label}</span>
                  </div>
                );
              })}
            </div>
          </section>
        )}

        {isReship && (
          <section className="order-detail-card order-detail-reship-info">
            <div className="order-detail-kv">
              <span>补发原因</span>
              <span>{order.remark || '商品破损'}</span>
            </div>
            <div className="order-detail-kv">
              <span>关联原订单</span>
              {order.originOrderId ? (
                <Link to={`/orders/${order.originOrderId}`} className="order-detail-link">
                  查看原订单
                </Link>
              ) : (
                <span>—</span>
              )}
            </div>
          </section>
        )}

        {item && (
          <section className="order-detail-card">
            <div className="order-detail-product">
              <div className="order-detail-product-thumb">
                <AppImage src={productImage} alt={item.productName} wrapperClassName="app-image--fill" />
              </div>
              <div className="order-detail-product-info">
                <div>
                  <h3 className="order-detail-product-name">{item.productName}</h3>
                  <p className="order-detail-product-spec">规格：{item.productSpec}</p>
                </div>
                <div className="order-detail-product-meta">
                  <span className="order-detail-product-price">
                    <small>¥</small>
                    {formatMoney(isReship ? 0 : Number(item.unitPrice)).replace('.00', '')}
                  </span>
                  <span className="order-detail-product-qty">x{item.quantity}</span>
                </div>
              </div>
            </div>

            {Number(order.benefitAmount) > 0 && !isReship && (
              <div className="order-detail-benefit-panel">
                <div className="order-detail-benefit-panel-left">
                  <div className="order-detail-benefit-icon">
                    <span className="material-symbols-outlined filled">confirmation_number</span>
                  </div>
                  <div>
                    <div className="order-detail-benefit-amount">
                      <span>¥{Math.round(Number(order.benefitAmount))}</span>
                      <span>好客权益</span>
                    </div>
                    <p className="order-detail-benefit-sub">全城100+餐厅通用</p>
                  </div>
                </div>
                <button type="button" className="order-detail-benefit-use" onClick={() => navigate('/redeem')}>
                  去使用
                </button>
              </div>
            )}
          </section>
        )}

        <section className="order-detail-card">
          <div className="order-detail-card-head">
            <h3>
              <span className="material-symbols-outlined">location_on</span>
              收货信息
            </h3>
            {canEditAddress && id && (
              <button
                type="button"
                className="order-detail-edit-btn"
                onClick={() => navigate(buildOrderAddressSelectUrl(id))}
              >
                <span className="material-symbols-outlined">edit</span>
                修改
              </button>
            )}
          </div>
          <div className="order-detail-kv-list">
            <div className="order-detail-kv">
              <span>收货人</span>
              <span>
                {order.receiverName} {maskPhone(order.receiverPhone)}
              </span>
            </div>
            <div className="order-detail-kv order-detail-kv--address">
              <span>收货地址</span>
              <span>{fullReceiverAddress(order)}</span>
            </div>
            <div className="order-detail-kv">
              <span>配送方式</span>
              <span>
                {deliveryProviderLabel(order.delivery?.provider, order.delivery?.logisticsCompany)}
              </span>
            </div>
            {order.delivery?.trackingNo && (
              <div className="order-detail-kv">
                <span>运单号</span>
                <span>{order.delivery.trackingNo}</span>
              </div>
            )}
            {order.delivery?.manualQueryUrl && (
              <div className="order-detail-kv">
                <span>物流查询</span>
                <a
                  href={order.delivery.manualQueryUrl}
                  target="_blank"
                  rel="noreferrer"
                  className="order-detail-link"
                >
                  查看物流
                </a>
              </div>
            )}
          </div>
        </section>

        {trackNodes.length > 0 && (
          <section className="order-detail-card">
            <h3 className="order-detail-card-title">
              <span className="material-symbols-outlined">timeline</span>
              物流动态
            </h3>
            <div className="order-detail-kv-list order-detail-kv-list--bordered">
              {trackNodes.map((node, index) => (
                <div key={`${node.trackInfo}-${index}`} className="order-detail-kv">
                  <span>{node.createdAt ? formatDateTime(node.createdAt) : '—'}</span>
                  <span>{node.trackInfo || '—'}</span>
                </div>
              ))}
            </div>
          </section>
        )}

        {!isReship && (
          <section className="order-detail-card">
            <h3 className="order-detail-card-title">
              <span className="material-symbols-outlined">info</span>
              订单信息
            </h3>
            <div className="order-detail-kv-list order-detail-kv-list--bordered">
              <div className="order-detail-kv">
                <span>订单编号</span>
                <span className="order-detail-kv-inline">
                  <span className="order-detail-order-no">{order.orderNo}</span>
                  <button type="button" className="order-detail-copy-btn" onClick={copyOrderNo}>
                    {copyHint || '复制'}
                  </button>
                </span>
              </div>
              <div className="order-detail-kv">
                <span>创建时间</span>
                <span>{formatDateTime(order.createdAt)}</span>
              </div>
              <div className="order-detail-kv">
                <span>支付方式</span>
                <span>{order.payment?.status === 'SUCCESS' ? '微信支付' : '—'}</span>
              </div>
            </div>
            <div className="order-detail-summary">
              <div className="order-detail-kv order-detail-kv--muted">
                <span>商品总额</span>
                <span>¥{formatMoney(productTotal)}</span>
              </div>
              <div className="order-detail-kv order-detail-kv--muted">
                <span>运费</span>
                <span>¥{formatMoney(freightTotal)}</span>
              </div>
              <div className="order-detail-kv order-detail-kv--total">
                <span>实付金额</span>
                <span className="order-detail-pay-total">¥{formatMoney(Number(order.payAmount))}</span>
              </div>
            </div>
          </section>
        )}
      </main>

      <footer className="order-detail-actionbar">
        <button type="button" className="order-detail-action-outline" onClick={() => setShowCs(true)}>
          <span className="material-symbols-outlined">headset_mic</span>
          联系客服
        </button>
        {canRefund && order?.status !== 'REFUNDING' && order?.status !== 'REFUNDED' && (
          <button
            type="button"
            className="order-detail-action-outline"
            onClick={() => navigate(`/after-sale?orderId=${order.id}&type=REFUND`)}
          >
            申请售后
          </button>
        )}
        {canInvoice && (
          <button
            type="button"
            className="order-detail-action-outline"
            onClick={() => navigate(`/invoices/apply?orderId=${order.id}`)}
          >
            申请发票
          </button>
        )}
        {canPay && (
          <button
            type="button"
            className="order-detail-action-primary"
            onClick={() => navigate(`/pay?orderId=${order.id}`)}
          >
            <span className="material-symbols-outlined">payments</span>
            去付款 ¥{formatMoney(Number(order.payAmount))}
          </button>
        )}
        {canConfirmReceive && (
          <button
            type="button"
            className="order-detail-action-primary"
            disabled={confirming}
            onClick={confirmReceive}
          >
            <span className="material-symbols-outlined">inventory</span>
            {confirming ? '提交中...' : '确认收货'}
          </button>
        )}
      </footer>

      {showCs && (
        <ContactCustomerSheet
          orderId={order.id}
          orderNo={order.orderNo}
          onClose={() => setShowCs(false)}
        />
      )}
    </div>
  );
}